Stoker-bridge.



P. L. CROWE.

STOKER BRIDGE.

APPLICATION FILED JULY 28. 1914.

1L %@%9U% Patented May 7, 1918.

PAUL L; cnown, or new relax, n. Y.

.STOKEB-BRIDGE.

Specification of Letters Patent.

Patented May 7, 1912.

Application filed July 28, 1914. Serial No. 853,625.

To all whom it may concern:

Be it known that I, PAUL L. Gnown, a citizen of the United States, and resident of New York, in the county of New York and State of New York, have invented certain new and useful Stoker-Bridgeaof which the following is a specification.

This invention relates to bridges for me chanical stokers, and it has for its object, among others, to provide a bridge constructed to aid the thorough combustion of any fuel that may be used in the operation of the furnace. i

Other objects and advantages of the invention will hereinafter appear and the novel features thereof will be particularly pointed out in the appended claims.

The invention is clearly illustrated in the accompanying drawings, which, with the numorale of reference marked thereon, form a part of this specification, and in which Figure 1 is a side view of my improved bridge.

Fig. 2 is a front View thereof.

Fig. 3 is a vertical cross section as on the line 33 of Fig. 2.

Like numerals of reference indicate like parts throughout the dilferent views.

In this form the bridge is fixed relative to the traveling stoker apron or grate, which latter is shown in dotted lines in Fig. 1.

The bridge 2 is of metal, hollow, and of approximately triangular cross section, as seen in Fig. 3, having an inclined side 3, an abrupt upright portion 4, and its under face formed with flanges 5 5, forming a fork 6, which latter is designed to embrace the horizontal portion 18 of the member 11 and thus be firmly held in position, see Fig. 1.

The inclined front wall or face 3 is pro: vided with perforations 10, which are of conical form, as seenin Fig. 3,and through which steam, gas or other fluid or vapor supplied through the opening 8 may be forced to escape, and act upon any unconsumed fuel forced up the incline by the rearward travel of the fire and ashes carried by the stoker, thus aflording means for complete combustion of all of the fuel.

Air will serve well, especially if it becomes heated in its traverse through the bridge before escaping. Steam in small quantities is also efiicient. A mixture of air and steam serves most satisfactorily under certain conditions. Even water, supplied in such small quantities as to be vasame.

porized before escaping, also aids materially.

The bridge may also rest upon angle irons 12. see dotted lines in Fig. 2.

The rear end of the stoker 16 is shown by dotted lines in Fig. 2. v

The bridge nose 17 is formed upon a greater or less curve or angle, as seen in Fi 1 and 3, so that the ashes will pass underneath the same, and by substituting therefor a bridge having a sharper or blunter end or nose the aperture for the escape of the ashes can be varied in accordance with the kind or quality of fuel to be used.

At the lower portion or nose of the inclined side 3, the bridge is so constructed as to either convey the ashes over the bridge, or to allow and aid the passage of the ashes underneath the bridge or to convey the incombustible and foreign matter remaining from the combustion of the fuel as above practically in both directions comparatively with the size of the said incombustible or clinl;er and also the size of the nose shown at 1 As the stoker grate 16 (Fig. 1 dotted lines) moves or travels toward the bridge its lower portion when pointed will convey the ashes or incombustible to and up the inclined side 3 thereof, and over the But should any unconsumed fuel be carried upon the bridge, the said fuel will be burnt up quickly instead of being carried over the bridge. In order to do this,

gas or steam or vapor is allowed to circulate mto the hollow space 7 of the brldge by the pipe 8 and the pressure can be such that it will forcibly issue against the unburnt fuel through the openings 10, and thereby effectually consume the fuel and prevent it from being wasted. The bluntness of the lower portion of the bridge 3, also allows a greater or less portion of the air supply to circulate between the bridge and grate for the more thorough combus tion of the fuel while the incombustible is being carried under the bridge by the moving grate.

What I claim is;

1. A stoker bridge formed hollow and having a substantially triangular form in cross section, the front inclined face thereof having perforations and the lower front edge being inclined rearwardly.

2. The combination with an endless traveling stoker, of a stoker bridge located at i the rear end of said stoker and having an upWardly-inclined front face with perforations and having its lower front edge curved rearwardly.

3. A stoker bridge formed hollow and substantially of triangular form in cross section With its front inclined wall having perforations of truncated conical form and having its lower front edge rounded with perforations through such rounded edge.

a. A stoker bridge formed hollow and of substantially triangular form in cross section, the front inclined face thereof having perforations and its rear under face providedwith separated flanges forming a fork.

the lower front edge of said face being rounded and inclined perforations extendingtherethrough,

Signed at New York in the county of New York and State of New York this 27 day of July A. D. 1914.

PAUL L. CROVVE. WVitnesses Gno. G. Sco'rT, Jo NASSAULT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents, Washington, D'. G. 

